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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9fe1352fe7ae704ab13f83b7e58f609ebdeffc5b4c1081181d9b9d77c4d4b8' 
  AND token = 'BAREBE1VzGGKHtQNZpPC/i+9TFAhic+lI1mUfEP6zH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}